Giakoumakis Georges, Primot Jérôme, Jarnac Amélie, Guitard Laureen, Stolidi Adrien
Opt Express. 2022 Nov 7;30(23):41147-41156. doi: 10.1364/OE.467503.
X-ray grating-based techniques often lead to artifacts in the phase retrieval process of phase objects presenting very fast spatial transitions or sudden jumps, especially in the field of non-destructive testing and evaluation. In this paper, we present a method that prevents the emergence of artifacts by building an interferogram corrected from any variations of the object intensity and given as input in the phase retrieval process. For illustration, this method is applied to a carbon fiber specimen imaged by a microfocus X-ray tube and a single 2D grating. A significant reduction of artifacts has been obtained, by a factor higher than 10. This evaluation has been performed experimentally thanks to the Confidence Map tool, a recently developed method that estimates the error distribution from the phase gradient information.
基于X射线光栅的技术在呈现非常快速的空间转变或突然跳跃的相位物体的相位检索过程中，常常会导致伪影，尤其是在无损检测和评估领域。在本文中，我们提出了一种方法，该方法通过构建一个从物体强度的任何变化校正而来的干涉图，并在相位检索过程中作为输入给出，从而防止伪影的出现。为了说明，该方法应用于由微焦点X射线管和单个二维光栅成像的碳纤维试样。已经实现了伪影的显著减少，减少因子高于10。借助置信度图工具（一种最近开发的从相位梯度信息估计误差分布的方法），通过实验进行了此评估。
